Add -test git attribute to tools/crunch-worker.js (emscripten-core#6403)

sbc100 · web-flow · commit 05f06cd60fb2 · 2018-04-02T11:34:58.000-07:00
Without this running `git grep` will often pick up
something in the 76,000 character line in this file.
diff --git a/.gitattributes b/.gitattributes
@@ -0,0 +1,3 @@
+# This file has a 76,000 charactar line which we don't to show up in the
+# output of `git grep`
+tools/crunch-worker.js -diff

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+# This file has a 76,000 charactar line which we don't to show up in the`
	`2`	+# output of `git grep`
	`3`	`+tools/crunch-worker.js -diff`